| 研究生: |
高祥倫 Kao, Hsiang-Lun |
|---|---|
| 論文名稱: |
成核過程對聚左乳酸分子於稀薄溶液中結晶成長的影響 The Influence of Nucleation Process to the Solution Crystallization of Poly(L-lactide) |
| 指導教授: |
阮至正
Ruan, Jr-Jeng |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2011 |
| 畢業學年度: | 99 |
| 語文別: | 中文 |
| 論文頁數: | 48 |
| 中文關鍵詞: | 聚左乳酸 、成核 、等溫結晶 、有序介穩態 |
| 外文關鍵詞: | PLLA, nucleation, isothermal crystallization, pre-ordering state |
| 相關次數: | 點閱:76 下載:0 |
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摘要
此研究透過不同的晶核形成方式,來探討聚左乳酸分子(poly(L-lactide),PLLA)於高溫稀薄二甲苯溶液(0.3wt%)中的結晶成長,受到結晶前分子聚集排列行為的影響。PLLA/對二甲苯溶液由結晶溶解溫度降至90 oC持溫,可以觀察到在沒有明顯結晶成長的情形下,於持溫四小時後溶液黏度出現大幅度的下降,推論是受到分子於溶液中聚集排列行為(pre-ordering state)的影響。溶液黏度下降後,以攪拌作用形成晶核所誘發的結晶成長,會有較慢的速率。所形成的截角菱晶(truncated lozenge crystal),也發展出較寬的(100)成長面。實驗的觀察指出截角菱形的單晶形態,是由初期成長的透鏡菱晶在持溫過程中逐漸轉變而來。此結晶形態的轉變,推論是由攪拌作用所形成的晶核,在透鏡菱晶內部誘發的板晶重組現象,逐漸向外擴張所造成。於溶解能力較佳的o-xylene溶液中,PLLA結晶析出的趨勢較低,亦觀察到透鏡菱晶轉變成具有較寬(100)成長面的截角菱晶。當以自成核機制使溶液降至結晶溫度即開始進行結晶成長,發現單晶的成長在不受到結晶前分子鏈聚集排列的影響下,可以有較快的成長速率,且於結晶成長初期即發展出截角菱晶的形態。由這一系列的研究可知,結晶前分子的聚集排列行為,不僅降低PLLA分子於二甲苯溶液中結晶析出的趨勢,亦造成單晶的成長發展出透鏡菱晶的形態。由於,溶液中分子的聚集排列行為幾乎沒有實驗方法可以直接觀察,因此這一系列的研究是首次以結晶成長習性的改變,來證實這個現象的存在及其可能帶來的影響。
ABSTRACT
This work investigates crystallization behavior of poly(L-lactide)(PLLA) in a dilute p-xylene solution via different nucleation process, which had been influenced by aggregation of molecules. Viscosity of the PLLA/p-xylene solution obviously drops after isothermal 4 hours at 90oC after dissolution and without crystallization occur, and we suggest that the unusual decrease in viscosity is induced by pre-ordering behavior of PLLA molecule. After decrease in solution viscosity, growth rate of stirring induced crystallization become slower, and the produced truncated lozenge crystals have larger L110/L100 ratio. We found that the truncated lozenge crystals develop from primary growth lenticular crystals, and we suggest the transformation is driven by lamellar reorganization of inner regime of lenticular crystals. Furthermore, We find that self-seeding induced crystals is truncated lozenge shape in early stage and has greater growth rate, which didn't influence by pre-ordering behavior. The results show that the pre-ordering behavior not only suppressed surface nucleation but also induce lenticular crystals.
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校內:2016-08-30公開